Figure 17. Anterior impingement. (a) Lateral plain film showing spurs arising from the anterior lip of the distal talus and the dorsal aspect of the talus (arrows). (b) Sagittal short tau inversion recovery image shows a spur arising from the anterior aspect of the distal tibia. Note the typical intra-articular position of the spur (arrow). There is also posterior subluxation of the talus indicating instability with incompetent anterior talofibular ligament.